Not sure how to explain this but......

Using a meta refresh to display a thankyou page for 5 seconds after a form submit, then return to form. If user clicks back to return to main page from form, returns to thankyou page instead, and has to go back to form again, then back to main page. I can have thankyou page return to main page, but would rather return to form.

This is what it should do:

main page -> form -> thankyou page -> form -> main page

This is what it does:

main -> form -> thankyou -> form -> thankyou -> form -> main


Is there any way to remove thankyou page from history?